Synchronizing device



Y Sept. 29, 1931. v A.. y MPP 1,824.999

SYNGHRONI Z ING DEVICE Filed Nov. 5, 1926 fk/w11? Pluma sspeza, 1931 l,

UNITED STATES 1mm-NT OFFICE- AUGUST JIP?, F BEBLIN-SPANDAU, GEB-im, ASSIGNOB 10 Bums AKTIENGESELLSCHAFT, 0F SIEIENSSTADT, .NEAR BERLIN, GEBIANY, A 00BP0- RATIO! 0l" 6mm mcnnomzins Davies Application nled November 5, 1988, Serial No. 140,345, and in Germany November 8, im.

The present invention relates to improvements in synchronizing devices. 'For many purposes, more particularly thel telegraphic transmission of images, there is required a 5, very thorough s nchronizing of the image cylinders or the ike devices at the transmittmg and at the receivin end. l The systems first used in prntin te egra hs, frequently fail to comply with t ese hig requirements,

1o as the frequency of the synchronizing current,

depending on the alternating current Ipendulum relays or generators, isrelative y'low. The working of the phonic wheel of La Cour is somewhat better. The higher however the x6 tuning fork frequency chosen, the faultier the contact, and therefore the smaller its controlling energy, so that considerable amplification has to be provided.

This inventlon relates to a synchronizing device which, as compared to rior systems,

has a very high synchronizin r uency (u to 300C-4000 periods an au lble. requency and at the same time has the advantage that it does not influence the whole driving energy of the receiver cylinder, but only equalizes the speed difference of the two cylinders at the transmitter and at the receiver end, which are driven at practically the'same speed. v

Accordin to the invention, these advantages a're o tained b coupling each of the driving motors whic are running with approximately the same power and speed, but otherwise independently of each other, at the transmitter and receiver ends, to a mean frequency generator which is constituted, in a manner ywell known in itself, by an liron disc rovided with a large number of teeth, whic during its rotation generates an alternating current in a fixed armature winding comprising two or more induction coils. The armature 1s magnetized by means of a direct current winding. The windings of the two generators, the disc diameters, numbers of teeth and amature winding of which are exactly equal to each other,lare connected together by means of a transmission system, e. g. by conductors or by a wireless system. The speed of each of these generators is positively brought into harmony with the speed of the other generator by the alternating current of the latter acting on it. This ener is suilicient to cause the disappearance la of the speed difference of the two driving motors up to a certain limit.

When using long conductors or lines causing considerable losses, or in the case of the v use of wireless transmission when the alternating current of the generators is utilized for the modulation of a high frequency carrier wave, the alternating currents transmitted will no longer possess the energy required for the synchronization of speed equalization. This drawback canbe easily remedied by means of an amplifier, such as for instance an amplifier valve, arranged in the line or in the transmitter or receiver. It is true that there still will take place then an influencing nl in the direction, grid circuit--anode circult, that is to say the enerator connected to the gridl circuit wil be able to drive the other very well in time, but not conversely. It is however possible even in this case to obtain a perfect equality of the mutual influencing by using a-two-way transmission system, that is to say, a system comprising two ortions or circuits, one for transmission 1n one direction and the other for .transmission in the other direction, each of said portions including one or more ampliers.

The drawing shows by way of example a construction according to the invention. m1, m2 are the driving motors belonging to the image cylinders or the like, at the transmitter and receiver ends res rigidly to the toothe iron discs 81,82 respectively which are of the same size. These disks, which -form part of electric currentgenerators, also have; ,t h`e, sanie "number of teeth (twentyfour iii-fthe' example illustrated). a1 and a2 are' the correspondlng fixed armatures, on the cores of which are arctively, and connected.

ranged the windings 'wl vor'w2 respectively l as well as the direct current preliminary I na netization windingsv gl or g2 respective y which are fed with current from the battery b1 or b2 respectively. KBetween the terminals c1 and c2 of the armature windings on one the other hand, -are'arranged the line Z and the .hand and their Vother. terminalsdl and d2 on rents of relativ produced. YWhen l say thatithe space be- A ampli'er r, the action of which is such that the motor m2 easily adapts itself even to relav tively strong uctuations in the speed ofthe vmotor m1. The generators are so constructed 5 as to produce currents of relatively high frequency, in accordance` withY the statements made in the introductory1 pragraphs .of this specification; Preferab y, as i Vsame pair of xed armatures a1 or a2 respectively; in the drawing, the space between the two xed poles al (or a2) is equal to six tooth divisions of the generator discs el, s2. Cure y high frequency are thus 'tween the twoiixed poles al or a2) is equal to six tooth divisions of the associated generator disks, (or s2 respectively), I mean to measure 2flgsuch space angularly or circumferentially, nthe arc of acircle whose center is on' the axis' of .the respective generator disk; in other words, the angle formed by two radii drawn from the axis of thegenerator disk to the cen- 2@ters of the twoxed poles of the same pair,

is just sir times as large as the angle formed by two radii drawn from the same axis to the central points oftevo adjoining teethy of the respective generator dish. When employing a relative arrangement in which the angular spacing of the two poles of the same pair is an exact multiple of the .spacing of adjoining teeth, Il obtain maximum electromotive :orcesf The variation oi the magnetic dus 5 will produce in the windings or coils 'w1 and 'wz potentials which are directly proportional to such variation. With constant force energizing, these variations are directly proportional to the magnetic resistance of the ciro cuit. lli the angular spacing oi the two poles is an exact multiple of the tooth spacing, two teeth will come simultaneously into registry with the poles of the same pair, and at such moments the magnetic resistance will'be a minimum; again, at other points of the revoa: under otherwise similar conditions, obtain the greatest possible fluctuations of the magnetic resistance an'd consequently the maximum potentials. lThe connection shown is of course` only one of the many possible conf 'structions .In thej same way for instance several valves could be used 1n cascade connection; further, or'the purpose .of securing a better res onse or speed adgu'stment, I

i might provi e a transformer of proper character, or like apparatus,onthe armature winding of the generators, in the grid circuit, or in the anode circuit-By constructing 'and operating the generators in such a manner that @5 the currents produced by them will have an lustrated, .tbespacingof the teeth on the generator discs 81, 10 s2 is much closer than that of the poles `of the audible frequency, I secure the important advantage that the ordinary telephone lines can be used for the transmission of the synchronizing currents, so that no special lines will have to be constructed.

What I claimis: l

'1. A synchronizing device comprisin a motor at the receiving station, both of said motors being adapted to run at approximately the same speed,A a generator driven by the 61st-mentioned motor, another generator driven by the second motor, the currents produced 4by each of said generators having a relatively high frequency, of about the order of-fup tothree thousand to four thousand cycles, said first-mentioned generator lincluding a rotatable iron -disk provided with a toothed edge and stationary armatures con-` stituted by coils and ironcores,said second generator likewise including a rotatable iron disk having'a toothed edge and fixed armatures constituted by coils and iron cores, and a transmission system connecting the coils of said generators with each other.

2. A synchronizing motor at the receiving station, both of said motors being adapted to run at approximate- .motor at .the transmitting station, anot er l device comprising a-v Ymotor at the transmitting station, another the same speed, asynchronous generator.

l diiven by the rst-named motor and producing electric impulses oi relatively high frequency, of about the order of up to three thousand to four thousand' cycles, another synchronous generator driven by the other mo' tor and producing electric impulses of the.

same frequency as the tiret-named generator, and a transmission system by which the im pulses are transmitted from one of said generators to the other.

3. A synchroniaing device comprising a motor at lthe transmitting station, another 1 motor 'at thev receiving station, both of said motors being adaptedto run at approximateldy the same speed, a synchronous generator riven' by the iirstenamed motor and reduc- Y ing electric impulses of relatively high ,fre-

uency, of about the order of up to three t ousand to founthousand cycles, another synchronous generator driven by the other motor and producing electric impulses of the saine frequency as the first-named generator,"

and a transmission system by which the impulses are transmitted from one of said generatorsto the other' lsaid transmission system including an amplil .ing device which is operativefor transmission inone direction only.

In testimony whereof l axf m signature.

Auen fr 51er. 

